U.S. President Joe Biden was due on Tuesday to sign documents endorsing Finland and Sweden's accession to NATO, the most significant expansion of the military alliance since the 1990s as it responds to Russia's invasion of Ukraine.
The U.S. Senate backed the expansion by an overwhelming 95-1 last week, a rare display of bipartisan unity in a bitterly divided Washington. Both Democratic and Republican Senators strongly approved membership for the two Nordic countries, describing them as important allies whose modern militaries already worked closely with NATO.
